Завдання 1001 - 1100 » 1100

Знайди значення виразу: 1) 4/17 + (–3/17) + (–5/17) + 6/17 = (4 + 6 - 3 - 5)/17 = 2/17; 2) 3/20 + (–7/20) + 9/20 + (–11/20) = (3 + 9 - 7 - 11)/20 = – 6/20 = – 3/10; 3) – 4/7 + 13/19 + (–3/7) + 26/19 = – 4/7 + (–3/7) + (13/19 + 26/19) = –1 + 3 = 2; 4) –21/3 + 52/3 + 71/3 + (–91/3) = –21/3 + (–91/3) + (52/3 + 71/3) = –112/3 + 13 = 11/3; 5) 41/7 + 25/9 + (–47/9) + (–41/7) = –(47/9 – 25/9) = –22/9; 6) – 1/2 + (–11/2) + (–21/2) + 5 + (–31/2) = (–1/2 + (–11/2) + (–21/2) + (–31/2)) + 5 = –8 + 5 = –3.